Fig. 5. The crystal structure of 2c with the key atoms being labelled and 35% thermal ellipsoids. H atoms except the two inner ones are omitted for clarity. Selected bond lengths (Å) for 2c: C(1)–C(2) 1.366(3), C(2)–C(3) 1.427(3), C(3)–C(4) 1.366(3), C(4)–C(5) 1.514(3), C(5)–C(6) 1.543(3), C(5)–C(10) 1.524(3), C(6)–C(7) 1.513(3), C(7)–C(8) 1.322(3), C(8)–C(9) 1.468(3), C(9)–C(10) 1.391(3), C(10)–C(11) 1.385(3), C(11)–C(12) 1.382(3), C(12)–C(13) 1.376(3), N(1)–C(9) 1.345(3), N(1)–C(13) 1.352(3), C(1)–B(1) 1.530(3), N(2)–C(4) 1.362(3).
